Controlled temperature manifold



July 5, 1949. A. K. LUHRS CONTROLLED TEMPERATURE MANIFOLD 2 Sheets-Sheet 1 Filed Oct. '7, 1946 V 2 Sheets-Shet? mk MN \N r .m

/////////.//VEPK/l///lll/Ill/l/Il/l/l/lf/lltl/ A. K. LUHRS CONTROLLED TEMPERATURE MANIFOLD lll/ l/l/w IHMf/J/ k I I July 5, 1949 Filed Oct. 1946 Patented July 5, 1949 so :STATES :eArreN'r OFFICE UONTR'O'LIJED" IFOED ArtlmnKenwood Luhrs, Garfield N. 'J., 'assignor to John- Roehrich; Hackensack,.N. J.

Apfilicationoctober 7, 1946; serialNofi'lolg'sm =1 This:inventionrrelates totmanifolds for internal combustion engines, and iris particularly i-adapteditoilmanifoldsjexhaust orsc'ombu'stioniiexshaust randrintakei for marine "engines, "and conviers'ionsttozamarine engines. i

It is an object of this invention to'provide'a Water or liquid cooled manifold "wherein the chamber tisreempletlyisurrounded by the coolwingi j acket to :provide fort-" a I more completeand emeientwzcoolingrof thenrcha'mber.

wwAnother objectz of thisiinventionsisto provide an :-improved iliquidi cooled manifold having an i inlet' 'passage'z andran -outlet passage about the a, exhaust rchamber 'wherebyta continuous passage -istprovided "to permit': circulation of the: coolant throughout the: cooling packetithereby eliminatr ing' the. possibility: ofideadespots r steam? pockets in the mamfold.

:-Still an other. obj ect: of" this :invention" is to pro- -vide: a controlled temperaturexexhaust' manifold byrproviding a :coo'ling:jacketmabout the exhaust (gas-v chamber wherein zthe. amountv'ofifiuid passing through :the cooling -j acket iszin direct proportion to the engine sspeed, :wvhereby ctthe :1 engine temirperature will be maintained atrarconstant degree oi -heat; a prime consideration forrefiicient engine rperformance.

A further a .aobject of this: invention is to providei'ailiquidicooledimanifol'dRhaving a coolant jacket completely about the exhaust gas chamber, the coolant' iacket 'bei-ngdivided longituditnallythere of into tan inlet pass age and an: outlet passage and having a removable end-plate formed with grooves or passages communicating between the inletandcuiil'etpassages, the grooves in the endtplate being of a restricted size Wherebyany ssedimentvin the coolant willbeideposited i'i'nfthe WE-StITClIQdr 'gIOOVES whence .it may be readily removed upon the removal of the end plate.

Another object of this invention is to use the heat of the exhaust gases which is drawn 01f by the liquid in the cooling jackets to warm this liquid to the proper temperature before passing into the cylinder block. As the liquid cools the manifold it absorbs the heat and accomplishes this action. This causes the engine to run at a normal temperature and also permits the temperature to reach this point much faster than former methods. The cracking of cylinder blocks caused by cold water entering a hot block is also eliminated by this system.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the mm. (cram-441) -drawingsiand specifications,=:and then more pari -ti'cularlyi.pointedout in the appended-claim.

Inith rdrawings, :Figureslrisraotop planview oft my manifold,

5 .iFigiureQ; is :a: siderzelevation thereof,

magine wherein it isndesiredito provide a cooling "3jacketvfor.=1themexhausttmaniiold. The exhaust manifold f I 0 ris particularly designed to 1 provide "enema/131011 301 2x00018311; liquid aboutthe exhaust r chamber tor iholdingcthe temperature .thereofat gsa .relatively-constant:heat at thevarious engine rspeeds. :P'I'he -exhaust -=manifold Ill constructed vaccordingwtor an :embodiment of mywinvention. is

\; constructed withri an elongated tubular exhaust :ig-as chamberd l,-which-ma be madeof any suitable metal,..-havingrboth ends thereof open. Ex-

rhaustgas inletp orits t2 .open into the. exhausttgas chamber. al l intermediate 1 the 1 length" thereof if or concluctingrthe-vhot exhaust gases *from thecengine intotheemanitoldzrlll; Y'Ihe ports 2 l2 maybe of a :more iOIrlGSS conventional construction A and .con-

figuration; z-having flanges i M or one long single s flange. onntherfree ends -thereofi for. bolting the 1.- m-anitold c I lit-on the engine. eT-he F number of aflanges may varyzfrom one to as manyas maybe 40 necessary dependent entirely upon the type 01' engine they are to be used on. The exhaust gases pass through the ports [4 and intothe exhaust gas chamber II when the engine is in operation. One end of the exhaust chamber ll will be closed by a cover plate to be more particularly described hereinafter so that the gas in the chamber I I will pass from the manifold i ii at the open end thereof out through any suitable muffler or other exhaust pipe.

For greater engine efficiency in marine engines and others, it is desirable to cool the exhaust manifold to a certain desired level with water or other suitable liquid coolant. To provide for such liquid cooling of the manifold I0, I have pro- 55 vided a water jacket l5'for completely surrounding the exhaust gas chamber II'. The cooling jacket I5 is formed of an elongated tube about the exhaust chamber H spaced therefrom along the length thereof. The jacket I5 is fixed to the ports H2 at the points where the ports 12 extend from the chamber II and must pass through the jacket 15, and is open at both ends. The coolant jacket [5 is divided into a pair of longitudinal chambers or passages f6 and I! by upper and lower longitudinal walls l8 and I9 respectively, between the exhaust chamber H and cooling jacket [5.

The front end of the manifold I is closed. with a front cover plate 20, which is bolted to the flange 2! on the front end of the jacket if: for closing the front end of the manifold Ill, and a seal is provided between the exhaust chamber II and the cooling liquid in the passages f6 and I1. The front end plate 20 is provided with an inlet opening or port 22 which opens into the outer chamber or passage l whereby liquid may be introduced into the manifold II] from the water pumps of the engine. An outlet port 24 is provided in the cover 29 in the opposite side from the port 22 and opens into the passage l1 whereby the coolant may be transferred from the manifold I0 after it has passed through the length of the chambers l6 and IT to the cylinder block.

In order to connect the chambers I6 and I! and to close the rear end of the jacket l5, a rear cover plate 25 is secured to the flange 26 on the rear end of the manifold l0. The'rear cover 25 is formed with a rearwardly extending nipple 21 to which an exhaust pipe may be attached, and is formed with an opening 28 therethrough for the passage ofthe exhaust gases from the chamber ll. The cover '25 is further formed with a pair of transverse grooves 29, one above and one below the opening 28, intermediate the width thereof, whereby liquid in the passage l'6 may pass into the chamber l1 and the coolant is circulated through the manifold Ill. The nipple 21 is formed with an opening 30 on the top side thereof to provide an outlet for water, from the cylinder block. The object of this is to discharge the water back to its original source and make use of this discharge to keep the exhaust pipe from getting too hot. The water is discharged directly into the exhaust outlet chamber and is blown out the exhaust'pipe by the exhaust pressure.

In the use and operation of this manifold 10, water or other suitable coolant is pumped into the chamber l6 from the engine driven water pump, and circulates through the grooves 29 and chamber l l whence it is let out through the port 24. The cooling effect of the liquid is dependent upon the amount of liquid in the chambers l6 and I i, so the desired temperature of the exhaust gas in the chamber II must be determined and. the

size of the jacket 15 constructed to suit the volum'e of liquid required. This volume is determined by the temperature desired and the capacity of the pump. When the size of jacket I5 is determined, the exhaust temperature will remain substantially constant since the increase in exhaust temperature at increased engine speed is compensated by the increase of the pump speed and the subsequent increase in the flow of the liquid in the jacket 15.

The flow of liquid in chamber [6 is a straight line until it reaches the end plate 25 where it is turned at right angles into the grooves 29. Liquid returns in chamber 11 and flows through outlet 24. The area of the grooves 29 is considerably less than that of the passage 16 so a restriction is caused in the flow at the same point as the change in direction. Such a restriction in the flow will cause any sediment in the liquid to be deposited at this point, and as the cover 25 is readily removable, the sediment may be removed periodically with little trouble.

I do not mean to confine myself to the exact details of construction herein disclosed, but claim' all variations falling within the purview of the appended claim.

What I claim is- An exhaust gas manifold comprising an elongated tubular exhaust gas chamber, exhaust gas inlet ports on said exhaust chamber, a cooling jacket about said exhaust chamber and spaced therefrom, a longitudinally extending wall on opposite sides of said exhaust chamber between said exhaust chamber and said cooling jacket providing a cooling inlet and outlet passage, an end cover plate for one end of said manifold formed with aninlet and outlet port communicating with said inlet and outlet passages respectively, a second end'cover plate for said manifold, said second cover plate formed with a central opening registering with an end of said exhaust chamber providing an outlet for the exhaust gas, said second plate formed with transverse groove communicating between said inlet and outlet passages, a peripheral flange about said cooling jacket at each end thereof, and means engaging said cover plates and said flanges for securing said plates selectively at either end of said manifold.

ARTHUR, KENWOOD LUHRS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,125,703 Williams Aug. 2, 1938 2,423,574 Barrett July 8, 1947 

